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In sexually reproducing organisms during...

In sexually reproducing organisms during reproduction, male gametes are produced in large numbers. Why?

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In almost all organisms, the female gamete is stationary and male gametes are mobile. The male gametes must travel through a medium to reach the female gametes. However, most of them fail to reach the female gametes. To compensate this loss of male gametes during transport, the number of male gametes produced is several thousand times the number of female gametes.
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